Emilie Miller is tapping her cowboy-booted foot in time to her father Ed's guitar strums. Her flowy red dress sways subtly as she saws on her fiddle and steps up to the microphone to sing. It's early ...

Back and forth, their bows glide across violin strings; hands noodle over fingerboards. But for all the effort, the students can't quite keep the rhythm. "I can tell we've had two weeks off. That was ...